Even though Dana, Amy, and Jack have escaped from the Troll, they know they're still in danger. Something sinister is going on in the old mine and the kids are determined to find out what it is. Dana is sure she's identified the Troll, but Amy and Jack can't believe he's someone they've trusted all their lives. The deeper Dana digs for answers the more questions she finds. Desperate, Dana tries to find a solution on her own-but who will believe her?